Using Ada for Semiconductor Assembly Equipment How ITEC uses Ada95 - - PowerPoint PPT Presentation

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Using Ada for Semiconductor Assembly Equipment

How ITEC uses Ada95 in semiconductor assembly equipment

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ITEC within Philips

Semiconductors Discrete Wafer fabs Philips ITEC 3 Assembly factories

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= Discretes = ICs Hong Kong Kaohsiung Manila Bangkok Seremban Stadskanaal Calamba

• 98/03

Assembly facilities, our customers

GS- 23

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BIM line setup

BIM: Break through In Manufacturing

Endless leadframe Adat Mould Plate Test, mark, tape Phicom

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ITEC equipment

• Adat: Die attach machine, takes die from wafer and solders it on

leadframe

• Phicom: Wire bond machine, bonds gold and aluminum wires from

die to leadframe

• Multiplunger: Mould products in plastic
• Parset: Tests devices to meet electrical specification
• Quad: Machine to cut and bend leads, laser mark, test and tape

products.

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Started with Ada95 5 years ago

Assembly machines use RTL/2 on 68k, tester used pascal on VAXeln Converted code to Ada95 automatically Reasons to start with Ada 95:

• Old code can be converted to Ada95 code
• Ada95 good programing environment compared with pascal
• GNAT available, based on gcc, lots of tools available

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Platform Windows NT

Why Windows NT:

• Advanced system services
• Cheap, runs on cheap hardware
• Integrates well in office environment
• Realtime properties good enough
• Advanced GUI

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Selection of Ada95

+++ positive

• Conversion from rtl/2, pascal possible
• Very good from engineering point of view
• Finally good compiler (GNAT)
• -- negative
• Nobody uses it (in Philips), everybody does C
• One must know C anyway

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Typical Equipment control

• High end motion controllers using fast DSP’s (9kHz cycle).
• Vision function: using frame grabber to get the image, then process

it on the pc

• Machine control multithreaded (typical 30-50 threads)
• Integration with Shop Floor Control system
• Support of many variants
• Response time to external events <1ms
• Setup as client/server

– Server performs the control – Client interacts with user

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Main architecture setup

NT kernel Machine control Client kernel mode WIN32 API user mode device driver device driver device driver

normal priority tcp/ip used for communication Realtime priority

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Interface with hardware & interrupts

Wrote special device driver for NT

• Allows user mode program to access physical memory
• Allows synchronization with interrupts
• User process can execute routine in kernel mode

Response times: Interrupt to thread

• average 40 microsecond
• maximum 1 millisecond

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GUI clients

• Visual ITEC (Build with CLAW)
• Scope (build with CLAW)
• Curve tracer (build with gnatcom, gwindows)

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Visual ITEC used as GUI interface (1)

In design mode:

Allows to define screen layout. Select objects from application into screen. Can make buttons that give commands to applications. Buttons can also invoke other screens.

In execute mode:

User makes use of screens defined.

Advantage: Application developer can focus on core of application.

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Visual ITEC used as GUI interface (2)

Object types for Visual itec:

• Text objects
• Chart objects
• Life video objects
• Wafermap objects (gives view of wafer with die processed)

Visual itec characteristics:

• Inquires server periodically to get its information
• Can run anywhere because of tcp/ip connection
• Can combine information from different servers in one form

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Visual ITEC used as GUI interface (3)

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Scope debugging tool

Scope architecture

• In our application we use circular buffers to store events with there
• time. Such an object is called a probe.
• Application can put time stamps with boolean in them
• Application can put floating point value with time in them.
• To get timestamps, we use rdtsc of pentium
• Setting a timestamp is very fast << 1us
• Application has low priority server that allows client access to data
• Client displays data graphically

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Conclusions

• Ada95 is very good programming language
• Ada95 tasking features makes machine control much simpler
• Ada95 gives stable applications because of its build in protection

mechanisms

• Ada95 made for proper software engineering
• Ada specs gives developer good idea of package content. When

properly setup increases reuse of packages.

• In the beginning NT support was just enough. Getting better each

year: stable gnat compiler, gnatcom, gwindows